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From: Guenter Roeck <>
To: NeilBrown <>, Thomas Graf <>,
	Herbert Xu <>,
	David Miller <>
Subject: Re: [PATCH 0/5] Fix rhashtable bit-locking for m68k
Date: Fri, 12 Apr 2019 11:08:41 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <155503371949.17793.8266195008003399968.stgit@noble.brown>

On 4/11/19 6:52 PM, NeilBrown wrote:
> As reported by Guenter Roeck, the new rhashtable bit-locking
> doesn't work on m68k as it only requires 2-byte alignment, so BIT(1)
> is addresses is not unused.
> We current use BIT(0) to identify a NULLS marker, but that is only
> needed in ->next pointers.  The bucket head does not need a NULLS
> marker, so the lsb there can be used for locking.
> the first 4 patches make some small improvements and re-arrange some
> code.  The final patch converts to using only BIT(0) for these two
> different special purposes.
> I had previously suggested dropping the series until I fix it.  Given
> that this was fairly easy, I retract that I think it best simply to
> add these patches to fix the code.
For the series:

Tested-by: Guenter Roeck <>

Tested with the series applied on top of next-20190412, running all
345 qemu tests. No boot failures or new warnings observed.


  parent reply	other threads:[~2019-04-12 18:08 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-12  1:52 NeilBrown
2019-04-12  1:52 ` [PATCH 1/5] rhashtable: fix some __rcu annotation errors NeilBrown
2019-04-12  1:52 ` [PATCH 5/5] rhashtable: use BIT(0) for locking NeilBrown
2019-04-12  1:52 ` [PATCH 2/5] rhashtable: reorder some inline functions and macros NeilBrown
2019-05-14 19:25   ` Jakub Kicinski
2019-04-12  1:52 ` [PATCH 4/5] rhashtable: replace rht_ptr_locked() with rht_assign_locked() NeilBrown
2019-04-12  1:52 ` [PATCH 3/5] rhashtable: move dereference inside rht_ptr() NeilBrown
2019-04-12 18:08 ` Guenter Roeck [this message]
2019-04-13  0:34   ` [PATCH 0/5] Fix rhashtable bit-locking for m68k David Miller

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